Hello! I came across this post and can't help but write that I too LOVED the movie "Secret life of Walter Mitty". When I left the cinema I felt so uplifted in spirit. The band Rogue Valley has a beautiful song in "Walter Mitty" called "The wolves and the ravens". I listened to it over and over after the movie, and then discovered more songs from them.
I will definitely watch Kate Perrys Firework. :) Thank you for the tip.